Well insulation and fracture prevention

摘要

A downhole Tool includes a Housing coupled to a Shaft Seal device, a pressure Actuated Valve disposed within the Housing and has a First piston that is ready to move in a First Chamber of pistonWhere the first piston coupled to a means of Transport, so that the tension in the Transport Medium is transmitted to the first piston, wherein, when reducing the strain on the means of Transport,The First piston moves into the first Chamber of the piston so that the wellbore Fluids have the ability to enter the first Chamber piston and a pressure Actuated Valve disposed within the Housing and has a Second piston is ready for af. Tie itself within a second Chamber for placing the second piston piston Chamber in communication of FLRun off with the first piston Chamber, where a Pressure drop through the downhole tool allows the second piston Moves so that the wellbore Fluids pass to the second Chamber and piston Through Hole Device isolation.